diff --git a/mev_inspect/block.py b/mev_inspect/block.py
index 69b11ed..037dc97 100644
--- a/mev_inspect/block.py
+++ b/mev_inspect/block.py
@@ -106,7 +106,7 @@ async def _fetch_block_timestamp(w3, block_number: int) -> int:
 
 
 async def _fetch_block_receipts(w3, block_number: int) -> List[Receipt]:
-    receipts_json = await w3.eth.get_block_receipts(block_number)
+    receipts_json = await w3.eth.get_block_receipts(hex(block_number))
     return [Receipt(**receipt) for receipt in receipts_json]
 
 
diff --git a/mev_inspect/fees.py b/mev_inspect/fees.py
index 2b4d35a..0a2d1f6 100644
--- a/mev_inspect/fees.py
+++ b/mev_inspect/fees.py
@@ -2,7 +2,7 @@ from web3 import Web3
 
 
 async def fetch_base_fee_per_gas(w3: Web3, block_number: int) -> int:
-    base_fees = await w3.eth.fee_history(1, block_number)
+    base_fees = await w3.eth.fee_history(1, block_number, [])
     base_fees_per_gas = base_fees["baseFeePerGas"]
     if len(base_fees_per_gas) == 0:
         raise RuntimeError("Unexpected error - no fees returned")